Clarence House has included a nod to the late Princess Diana in a photo montage created to mark Prince Charles' 70th birthday.

The slideshow, shared on the palace's official social media pages, includes images taken throughout the heir apparent's life, from his birth in 1948 up to the delightful new family portraits shared by the Royal Family this week.

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While Charles' marriage to Diana ended in a very public way, with both parties eventually admitting to affairs, fans were pleased to note she still made an appearance in the montage.

Taken in 1985—four years after the couple's wedding—the photograph depicts the Prince and Princess of Wales with their sons Prince William, two, and eight-month-old Prince Harry.

The family is seen aboard the Royal Yacht Britannia during a three-week tour of Italy, which ended in Venice.

Diana was just 23 at the time.

The photo of Princess Diana included in the birthday tribute. (Getty)

Clarence House's followers clearly enjoyed the montage and the inclusion of the late 'People's Princess'.

However, several took umbrage at the fact only one image of Diana appeared, while there were several of Charles' second wife, Camilla, Duchess of York.